Process for recycling spent pot linings (spl) from primary...

C - Chemistry – Metallurgy – 22 – B

Patent

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Details

C22B 7/00 (2006.01) A62D 3/38 (2007.01) B09B 3/00 (2006.01) C01F 7/50 (2006.01) C22B 21/00 (2006.01) C25C 3/08 (2006.01)

Patent

CA 2704450

The present invention relates to a process for recycling SPL (spent pot linings), from primary aluminium production, comprising the steps of grinding the separated fractions or cuts, separating materials by means of mechanical treatment, mixing salt slags with SPL, dissolving in water the product obtained in the previous step, carrying out a chemical reaction between water and the materials to be made inert, sedimenting, removing cyanides, filtering to obtain a soluble fraction and another insoluble fraction, washing the insoluble fraction, crystallizing salts of the soluble fraction and aging or conditioning the insoluble fraction. The present invention further relates to the product obtained by means of said process and the use thereof as new material in different fields of industry.

La présente invention concerne un procédé pour le recyclage des brasques usées (SPL, provenant de la production d'aluminium primaire, comprenant les étapes consistant à broyer les fractions ou découpes séparées, à séparer les matières au moyen d'un traitement mécanique, à mélanger des résidus salés avec les SPL, à dissoudre dans l'eau le produit obtenu dans l'étape précédente, à effectuer une réaction chimique entre l'eau et les matières que l'on doit rendre inertes, faire décanter, à éliminer les cyanures, à filtrer pour obtenir une fraction soluble et une autre fraction insoluble, à laver la fraction insoluble, à faire cristalliser les sels de la fraction soluble et à faire durcir par précipitation ou à conditionner la fraction insoluble. La présente invention concerne en outre le produit obtenu au moyen dudit procédé et l'utilisation de celui-ci comme nouveau matériau dans différents domaines de l'industrie.

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